√121 = 11. The square root of 121 is 11, because 11 × 11 = 121. 121 is a perfect square.
√121 at a glance.
Value
11
Rounded
11
Perfect square?
Yes
121 squared
14,641
Checking it in your head
A perfect square's root is a whole number, so check by multiplying back: 11 × 11 = 121. Its last digit fits too: squares only ever end in 0, 1, 4, 5, 6 or 9, and 11² ends in 1.
Frequently asked questions
What is the square root of 121?
The square root of 121 is 11, because 11 × 11 = 121. 121 is a perfect square.